/Engine/Source/Editor/SubobjectEditor/Public/SSubobjectBlueprintEditor.h
Builds a context menu pop up for dropping a child node onto the scene root node
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > BuildSceneRootDropActionMenu ( FSubobjectEditorTreeNodePtrType DroppedOntoNodePtr, FSubobjectEditorTreeNodePtrType DroppedNodePtr )